As someone else posted NRV invented the slide in a slide. One big advantage to it is usability of the interior when turtled. Also if you have a narrow spot you only put the first level of slide out and you will be size of a regular slide.
Second and bigger advantage of slide in slide on street side is more or less same space in living area as with oposing slides BUT no slide on curb side to reduce avail awning/shade space.
A "Retired" Mind is a Terrible Thing to Waste
Foreman Chuck USNR, USAF & USCGA
BAR-BOB Ranch, San Barnard River Valley, Texas
2010 Damon Daybreak Classic 32'
1990 Jeep Wrangler
2011 Sea Eagle 385 FT kayak
2012 Vilano Tuono road bike
You talk about Uniqueness in a RV! IMHO, Hands down is the Chariot! You can order them on a Volvo or a Class 8 Freightliner Chassis. Super nice luxury coaches 45' in length, 34' in the living quarters with full wall slides. Google Chariotrv.com
Well - well what you can learn by asking the right question. Asked HR about lack of info(corp website) on the Aluma Lite 31sf3. Answer - no more production till interest in floor plan improves. So if you want a collectors item REAL cheap!!!! Another one bites the dust.